/*
 * C/C++ KLIB Project
 * 
 * Copyright (c) 2012 Ken Zhang (cpp.china@gmail.com)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA  02111-1307  USA
 *
 */

#include <string.h>
#include "klib.h"

int strrep(char *str, size_t size, const char *tofind, const char *replacement)
{
	int len1;
	int len2;
	int n = 0;
	char *p, *q;

	if (size == 0 || str == NULL || tofind == NULL || replacement == NULL)
		return -1;
	
	len1 = strlen(tofind);
	len2 = strlen(replacement);

	p = str;
	while (p = strstr(p, tofind)) {
		if (len2 > len1 && strlen(str) + (len2 - len1) + 1 > size)
			return n;
		q = p + len1;
		memmove(q + len2 - len1, q, strlen(q) + 1);
		memcpy(p, replacement, len2);
		p += len2;
		++n;
	}

	return n;
}
